Contact-commutated electric motor

Patent metadata

Field	Value
Publication number	US-9960560-B2
Application number	US-201314423646-A
Country	US
Kind code	B2
Filing date	Aug 14, 2013
Priority date	Aug 31, 2012
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

An electric motor with contact commutation may include an external stator and an internal, rotatably mounted rotor. A magnet arrangement including at least one permanent magnet may be arranged fixedly on the rotor. A coil arrangement including at least one electric coil may be arranged fixedly on the stator. A contact commutation assembly may be in communication with the coil arrangement.

First claim

The invention claimed is:

1. An electric motor with contact commutation, comprising:
an external stator and an internal, rotatably mounted rotor;
a magnet arrangement including at least one permanent magnet arranged fixedly on the rotor;
a coil arrangement including at least one electric coil arranged fixedly on the stator;
a contact commutation assembly in communication with the coil arrangement, the contact commutation assembly including a contact element arrangement that is driven rotatably by the rotor and includes at least one contact element, and a slip ring arrangement that is arranged rotationally fixed relative to the stator and electrically connected to the coil arrangement;
wherein the slip ring arrangement includes a plurality of slip rings, and at least two slip rings of the plurality of slip rings define a slip ring group and are electrically connected to one another via the at least one contact element; and
wherein the slip ring group has two slip rings that define a slip ring pair;
the slip ring pair includes a first slip ring and a second slip ring;
the first slip ring being electrically connected to at least one of the coil arrangement and a coil strand associated with the coil arrangement;
the second slip ring being segmented in a circumferential direction and including (i) at least one plus-pole segment, the at least one plus-pole segment electrically connected to a plus-pole terminal, the plus-pole terminal being connected to a plus pole of a power supply; (ii) at least one minus pole segment electrically connected to a minus-pole terminal, the minus-pole terminal connected to a minus pole of the power supply; and (iii) at least two insulator segments, the at least two insulator segments being arranged in each case between the at least one plus-pole segment and the at least one minus-pole segment in the circumferential direction.

2. The electric motor according to claim 1 , wherein:
a magnetic north pole and a magnetic south pole respectively define a magnetic pole pair within the magnet arrangement, and
the number of plus-pole segments and the number of minus-pole segments is equal to the tuber of magnetic pole pairs.

3. The electric motor according to claim 1 , wherein the coil arrangement includes a plurality of coil strands each provided by a winding defining a single coil or a plurality of coils connected in series;
the first slip ring is segmented in a circumferential direction defining a plurality of plus-pole segments, the plurality of plus-pole segments electrically connected to a plus-pole terminal, the plus-pole terminal connected to a plus pole of a power supply, and each of the plurality of coil strands has at least one coil segment, which is electrically connected to the respective coil strand, wherein the plurality of plus-pole segments and the plurality of coil segments are electrically insulated with respect to one another in the circumferential direction; and
wherein the at least one minus-pole segment of the second slip ring includes a plurality of minus-pole segments electrically connected to a minus-pole terminal that is connected to a minus pole of the power supply, and each of the plurality of coil strands has at least one coil segment, which is electrically connected to the respective coil strand, wherein the plurality of minus-pole segments and the plurality of coil segments are electrically insulated with respect to one another in the circumferential direction.

4. The electric motor according to claim 3 , wherein:
the plurality of plus-pole segments and the plurality of coil segments of the first slip ring follow one another in the circumferential direction such that at least one coil segment is arranged between two plus-pole segments, and
the plurality of minus-pole segments and the plurality of coil segments of the second slip ring follow one another in the circumferential direction such that at least one coil segment is arranged between two minus-pole segments.

5. The electric motor according to claim 3 , wherein:
the first slip ring further includes an electrically insulating insulator segment for each coil segment, wherein the plurality of plus-pole segments, the plurality of insulator segments and the plurality of coil segments following one another in the circumferential direction such that each coil segment adjoins one of the plurality insulator segments on one side and one of the plurality of plus-pole segments on the other side, and
the second slip ring further includes an electrically insulating insulator segment for each coil segment, wherein the plurality of minus-pole segments, the plurality of insulator segments and the plurality of coil segments following one another in the circumferential direction such that each coil segment adjoins one of the plurality of insulator segments on one side and one of the plurality of minus-pole segments on the other side.

6. The electric motor according to claim 5 , wherein at least one of:
the plurality of respective insulator segments in the circumferential direction are larger than at least one of the plurality of respective plus-pole segments, the plurality of respective minus-pole segments and the plurality of respective coil segments, and
the plurality of respective coil segments in the circumferential direction have a size the same as at least one of the plurality respective plus-pole segments and the plurality of respective minus-pole segments.

7. The electric motor according to claim 3 , wherein in the first slip ring, each of the plurality of coil segments in the circumferential direction adjoins one of the plurality of plus-pole segments on both sides thereof, and in the second slip ring, each of the plurality of coil segments adjoins one of the plurality of minus-pole segments on both sides in the circumferential direction.

8. The electric motor according to claim 7 , wherein the plurality of respective coil segments in the circumferential direction are smaller than at least one of the plurality of respective plus-pole segments and the plurality of respective minus-pole segments.

9. The electric motor according to claim 8 , wherein the at least two slip rings are integrated into at, least one of an axial end face of the stator and a housing containing the stator in a rotationally fixed manner.

10. The electric motor according to claim 3 , wherein:
the plurality of coil segments in the first slip ring follow one another in the circumferential direction and are separated from one another by at least one of the plurality of plus-pole segments, wherein the plurality of coil segments in the first slip ring are respectively associated with one of the plurality of coil strands, and
the plurality of coil segments in the second slip ring follow one another in the circumferential direction and are separated from one another by at least one of the plurality of minus-pole segments, wherein the plurality of coil segments of the second slip ring are respectively associated with one of the plurality of coil strands.

11. The electric motor according to claim 10 , wherein at least one of the plurality of coil segments in at least one of the first slip ring and the second slip ring, the at least one coil segment being associated with one of the plurality of coil strands, adjoins another coil segment in the circumferential direction associated with a different coil strand of the plurality of coil strands.

12. The electric motor according to claim 11 , wherein:
the plurality of coil segments of the first slip ring which adjoin the at least one plus-pole segment on both sides in the circumferential direction are the same size in the circumferential direction as the at least

Assignees

• Mahle Int Gmbh

Inventors

• Froebel Marcel
• Helmis Martin
• Mack Bernd
• Wieske Peter

Classifications

• H02K23/62 Primary

  Motors or generators with stationary armatures and rotating excitation field · CPC title

• H01R39/18 Primary

  Contacts for co-operation with commutator or slip-ring, e.g. contact brush · CPC title

• H02K13/003

  Structural associations of slip-rings · CPC title

• H02K13/006

  Structural associations of commutators · CPC title